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\(a.35-17+1993-35-1993\\ =-17+\left(35-35\right)+\left(1993-1993\right)\\ =-17+0+0\\ =-17\\ b.-48725-\left(357-48725\right)+300\\ =-48725-357+48725+300\\ =\left(300-357\right)+\left(48725-48725\right)\\ =-57+0\\ =-57\\ c.3579-\left(49-5+3579\right)+49\\ =3579-49+5-3579+49\\ =5+\left(3579-3579\right)+\left(49-49\right)\\ =5+0+0\\ =5\)
a) \(35-17+1993-35-1993\)
\(=\left(35-35\right)+\left(1993-1993\right)-17\)
\(=-17\)
b) \(-48725-\left(357-48725\right)+300\)
\(=\left(-48725+48725\right)+\left(300-357\right)\)
\(=-57\)
c) \(3579-\left(49-5+3579\right)+49\)
\(=\left(3579-3579\right)+\left(49-49\right)+5\)
\(=5\)
3579 - ( 49 - 5 + 3579 ) + 49
= 3579 - 49 + 5 - 3579 + 49
= ( 3579 - 3579 ) + ( 49 - 49 ) + 5
= 0 + 0 + 5
= 5
Bài 1:
a) - | 12 - 14 | - | 98 - 15 + 2 | - 14
= - | - 2 | - | 85 | - 14
= -2 - 85 - 14
= -101
b) ( -24 ) - ( 12 - 19 ) - | 15 - 12 - 7 |
= ( -24 ) - ( - 7 ) - | -4 |
= ( -24 ) + 7 - 4
= -21
Bài 2:
a) 5 - ( 1997 - 2005 ) + 1997
= 5 - 1997 + 2005 + 1997
= ( 5 + 2005 ) + ( 1997 - 1997 )
= 2010 + 0
= 2010
b) 1579 - ( 53 + 1679 ) - ( -53 )
= 1579 - 53 - 1679 + 53
= ( 1579 - 1679 ) + ( 53 - 53 )
= ( -100 ) + 0
= -100
c) -48725 - ( 357 - 48725 ) + 300
= -48725 - 357 + 48725 + 300
= [( -48725 ) + 48725 ] + ( 357 - 300 )
= 0 + ( -57 )
= -57
d) 4567 + ( 1234 - 4567 ) - 4
= 4567 + 1234 - 4567 - 4
= ( 4567 - 4567 ) + ( 1234 - 4 )
= 0 + 1230
= 1230
a) \(-\left|12-14\right|-\left|98-15+2\right|-14\)
\(=-\left|2\right|-\left|85\right|-14\)
\(=\left(-2\right)-85-14\)
\(=\left(-2\right)-\left(85+14\right)\)
\(=\left(-2\right)-99\)
\(=\left(-2\right)+\left(-99\right)=-101\)
(14568+3579)-(14563+3564)
= 14568+3579-14563-3564
=(14568-14563)+(3579-3564)
=5+15=20
\(8.49.20.125.5=49.\left(20.5\right).\left(125.8\right)=49.100.1000=4900000\)
49 . 55 + 46 . 49 - 49
=49(55+46)-49
=49.101-49
==> =49.100
=4900
9) -48725 - ( 357 - 48725 ) + 300
= - 48725 + ( - 357) + 48725 + 300
= [ ( - 48725 ) + 48725 ] + [ ( - 357) + 300]
= 0 + ( -57)
= - 57
10) 3579 - ( 49 - 5 + 3579 ) + 49
= 3579 + ( -49) + 5 + ( -3579) +49
= [ 3579 + ( -3579) ] + [ ( - 49) + 49] + 5
= 0 + 0 + 5
= 5
9) - 48275 - ( 357 - 48725 ) + 300
= -48275 - 357 + 48725 + 300
= ( - 48725 + 48725 ) + ( -357 + 300)
= -57
10) 3579- ( 49 - 5 + 3579 ) + 49
= 3579 - 49 + 5 - 3579 + 49
= ( 3579 - 3579) + (-49 + 49) + 5
= 0+0+5= 5